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Don't count on a "battery tender" to charge a low or discharged battery. They are only designed to keep a charged battery up and not re-charge one. I've got 2 "Battery Minders" w/desulphiting and I guess they work. I don't use any meters on the batteries but I haven't had any low battery problems with them. I only use mine during the really slow use periods in winter low temps and never in the summer...
